How to create a query using where with Reference Field

[Kronhyx]

I got something like this

  async findByUser(ref: IDocumentRef<UserModel>) {

    const snapshot = await Collection(WalletModel).query()
      .where('user', '==', ref).get();

    return snapshot.docs;
  }

and it is generating this error

FirebaseError: Function Query.where() called with invalid data. Unsupported field value: a custom DocumentRef object